Anisotropic and temperature-dependent growth mechanism of S-phase precipitates in Al-Cu-Mg alloy in relation with GPB zones

Mei Jie Yin, Jiang Hua Chen*, Shuang Bao Wang, Zi Ran Liu, Li Mei Cha, Shi Yun Duan, Cui Lan Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

By employing atomic-resolution imaging and first principles energy calculations, the growth behavior of S-phase precipitates in a high strength Al-Cu-Mg alloy was investigated. It is demonstrated that the nucleation and growth of the S-phase precipitate are rather anisotropic and temperature-dependent companying with low dimensional phase transformation. There are actually two types of Guinier-Preston (GP) zones that determine the formation mechanism of S-phase at high aging temperatures higher than 180 °C. One is the precursors of the S-phase itself, the other is the structural units or the precursors of the well-known Guinier-Preston-Bagaryatsky (GPB) zones. At high temperatures the later GPB zone units may form around S-phase precipitate and cease its growth in the width direction, leading to the formation of rod-like S-phase crystals; whereas at low temperatures the S-phase precipitates develop without the interference with GPB zones, resulting in S-phase precipitates with lath-like morphology.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalTransactions of Nonferrous Metals Society of China
Volume26
Issue number1
DOIs
StatePublished - 1 Jan 2016
Externally publishedYes

Keywords

  • age hardening
  • aluminum alloy
  • anisotropy
  • crystal growth
  • precipitation

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